1. 1) W. K. Asbeck et al., J. Colloid Sci., 7,306 (1952).
2. 2) R. J. Blackinton, Official Digest, 25,205 (1953).
3. 3) D. J. Doherty, R. Hurd, J. Oil & Color Chem. Assoc., 41, No. 1, 42 (1958).
4. 4) L. Dintenfass, ibid, 41, No. 2,125 (1958).
5. 5) W.K. Asbeck, Official Digest, 33, 65 (1961).